The so-called degree is the unknown supreme power. For example, a quadratic equation contains an x 2 or y 2 term, and all other terms are linear or constant. As long as they form an equation, it is a quadratic equation. One unknown is a quadratic equation and two unknowns are a quadratic equation. If there are several unknowns, there must be a set of equations composed of several equations to solve the problem. If the number of equations is not enough, the equations will have countless solutions. It can also be said that it cannot be solved.
For example: 3x+2y-3z= 1, which is a ternary linear equation;
3x 2+2y-z = 5, 2x 2+3xy+5y 2+6xz+3z+8 = 0, all of which are ternary quadratic equations.
If you want to understand these problems, you only need to do a few questions, and it will be clear soon. More practice is the fundamental way to solve the problem.